Question about putting journaling module in the event handlers? about exchange-core

[mzheravin]

Hi @rhzx3519
Yes disk journaling module IO is slowing down whole core, total latency will be about 50us-200us (depending on hardware and traffic).
By default, initializer does not attaching jounraling event handler and does not put extra sequence barrier for it. Theese are only added if jounraling is turned on.
The idea is that, accouring to some regulations, exchange should not return to the client anything that was not written into journal (meaning of that can vary). If there is no such requirement, then journal writing can be initiated at any point and we dont care much when it is finished.

[rhzx3519]

@mzheravin Thanks for your answer!